Nicholas Scott's presentation on tuning Nagios performance. The presentation was given during the Nagios World Conference North America held Sept 27-29th, 2011 in Saint Paul, MN. For more information on the conference (including photos and videos), visit: http://go.nagios.com/nwcna

1. Nagios Performance Tuning Nick Scott [email_address]

4. Offloading MySQL with NDOUtils

5. Memcached Systems

7. Baseline System Used and Method of Analysis

8. Specs VM Specs Operating System CentOS 6 2.6.32 i686 Processors 2 CPUs RAM 1GB RAM Hard Disk 20GB Host Version VMware Workstation 7.1.4 build-385536 Nagios Details Nagios Version Nagios Core 3.2.3 Active Host Checks 1002 Hosts Active Service Checks 4012 Services Check Frequency 5min Event Broker* NDOUtils * - Unless otherwise noted

11. Chose log file with least extrema

14. r/s

15. await

16. avgqu-sz

17. avgrq-sz

18. RAM Disks

21. Uses actual RAM, not ideal for large files

22. Miscalculation will cause more harm than good

24. status.dat

26. Computer treats it like any other RAM mounted volume, for better or for worse

28. Calculate size

29. Mount tmpfs / edit fstab

30. Edit nagios.cfg

32. RAM Disk – Request Reads / Sec R = ~.852 of Vanilla Read Requests Per Second for Device sda Time

33. RAM Disk – Request Writes / Sec R = ~.98 of Vanilla Write Requests Per Second for Device sda Time

34. RAM Disk – Device Queue R = ~.556 of Vanilla Number of Items In Write Queue for Device sda Time

35. RAM Disk – Wait Queue R = ~.869 of Vanilla Average Wait (ms) Time

37. Will help overtaxed hard drives

38. Offloading MySQL with NDOUtils

42. Increased wait time on results

43. Bandwidth utilization

44. Requires additional hardware/virtualization

47. Abstraction

49. Requires additional server, additional software

50. Adds possible point of failure

52. config.inc.php

53. config.php

54. Offloading MySQL – Request Reads / Sec R = ~.76 of Vanilla Read Requests Per Second for Device sda Time

55. Offloading MySQL – Request Writes / Sec R = ~2.05 of Vanilla Write Requests Per Second for Device sda Time

56. Offloading MySQL – Average Size In Queue R = ~.707 of Vanilla Write Requests Per Second for Device sda Time

57. Offloading MySQL – Device Queue R = ~.55 of Vanilla Number of Items In Write Queue for Device sda Time

58. Offloading MySQL – Wait Queue R = ~.529 of Vanilla Average Wait (ms) Time

60. Nearly 50% reduction in hardware demand

61. Smaller files in queue, but more writes

62. Memcache

64. Can be one, or many memcache servers

66. Hits database

67. Updates database

68. Removes from cache on update

70. Hardware can be most anything

72. Improper coding can cause incorrect returns

73. Creates lots of network traffic

75. Memcache – Request Reads / Sec R = ~.15 of Vanilla Read Requests Per Second for Device sda Time

76. Memcache – Request Writes / Sec R = ~11.47 of Vanilla Write Requests Per Second for Device sda Time

77. Memcache – Average Size In Queue R = ~.27 of Vanilla Write Requests Per Second for Device sda Time

78. Memcache – Device Queue R = ~1.55 of Vanilla Number of Items In Write Queue for Device sda Time

79. Memcache – Wait Queue R = ~.259 of Vanilla Average Wait (ms) Time

81. Large reduction in reads

82. Massive increase in writes

83. Test did not accurately portray scalability

84. Passive Checks

87. Eases some cross-platform issues

91. NRDP

94. Have a way to profile your install